Texas Instruments CD4514BE

Overview

CD4514BE from Texas Instruments is a 4-bit latched binary-to-16-line decoder/demultiplexer with active-high outputs and internal latching. It operates over a 3-V to 18-V supply range, features TTL-compatible inputs, supports cascading via ENABLE and STROBE inputs, and is used in memory address decoding and I/O port expansion circuits.

For engineers reviewing the CD4514BE datasheet, CD4514BE pinout, CD4514BE application, or CD4514BE equivalent, key selection considerations include its 16-line active-high decoded output drive capability, latch-enable timing requirements, wide V_DD tolerance (3–18 V), and compatibility with CMOS logic families in industrial control and legacy microprocessor systems.

Technical Context

The CD4514BE implements a synchronous 4-bit address decode with transparent latch control: input data is latched on the rising edge of the STROBE signal, then decoded to one of sixteen active-high outputs. All outputs remain static until the next valid latch event.

It uses standard CMOS silicon-gate technology, ensuring low static current draw (<100 nA at 5 V), high noise immunity (typ. 45% V_DD), and rail-to-rail output swing. Input thresholds are referenced to V_DD/2, enabling reliable interfacing with both CMOS and buffered TTL logic sources.

Key Specifications

Pinout & Package

CD4514BE is supplied in a 16-lead plastic dual-in-line package (PDIP-16), compliant with JEDEC MS-011. Body dimensions: 19.3 mm × 6.35 mm × 3.94 mm (L × W × H), 2.54 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-bit latched decoder applications.

Compared with CD4515BE and 74HC4514, the CD4514BE uniquely combines active-high outputs, wide-voltage operation (3–18 V), and integrated latching - making it the sole choice for retrofitting legacy 12-V or mixed-rail systems requiring glitch-free, self-contained decoding.

Availability

CD4514BE is available at Aetrix Electronics and suitable for memory address decoding, I/O port expansion, legacy microprocessor support, and industrial panel logic requiring stable component supply across extended temperature and voltage ranges.

Supply support for CD4514BE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The CD4514BE belongs to TI's legacy CMOS logic family, designed specifically for robust, low-power address decoding and peripheral selection in industrial control, retro-computing, and maintenance-critical embedded systems.

FAQ

What is the maximum operating voltage for the CD4514BE?

The CD4514BE supports a supply voltage range from 3 V to 18 V DC. Its absolute maximum rating is 20 V, but sustained operation above 18 V risks parametric shift and reduced lifetime. At 18 V, output drive capability reaches ±4.2 mA per Yx pin, making CD4514BE suitable for direct relay or LED driving in industrial 12–15 V systems without external buffers.

Does the CD4514BE require an external latch circuit?

No, the CD4514BE includes an internal transparent latch controlled by the STROBE input. When STROBE transitions from low to high, the current states of A0–A3 are captured and held, then decoded to the appropriate Y0–Y15 output. This eliminates the need for external latches like the 74HC373 in systems where address stability during bus transitions is critical - a key advantage of CD4514BE over non-latching alternatives.

Can the CD4514BE drive TTL loads directly?

Yes, the CD4514BE can directly drive standard TTL inputs under typical conditions. At V_DD = 10 V, each Yx output sources up to 4.2 mA (high) and sinks up to 4.2 mA (low), exceeding the 400 µA high-level and 16 mA low-level input requirements of 74LS-series TTL. However, at V_DD = 5 V, output drive drops to ~1.5 mA, so verify fan-out limits when interfacing with multiple 74LS inputs - CD4514BE remains compatible but may require buffering for >5 LS loads.

How does the ENABLE pin function on the CD4514BE?

The ENABLE pin (Pin 6) is an active-high global output control. When ENABLE = low, all Y0–Y15 outputs enter a high-impedance state regardless of address or STROBE state - effectively disabling the decoder. When ENABLE = high, normal latched decoding resumes. This allows CD4514BE to be gated by higher-level system signals (e.g., CPU MREQ̅, memory space select), making it ideal for hierarchical decoding architectures where multiple CD4514BEs share address bus segments.

Is the CD4514BE pin-compatible with the CD4515BE?

Yes, the CD4514BE and CD4515BE share identical pinouts, package dimensions, timing parameters, and supply specifications - the only functional difference is output polarity: CD4514BE has active-high outputs (Y0–Y15), while CD4515BE has active-low outputs (Y0̅–Y15̅). No PCB changes are required when substituting between them; only logic-level inversion in downstream circuitry must be accounted for. This makes CD4514BE and CD4515BE true drop-in alternatives for polarity-sensitive designs.